Getting the Most from Paired-User Testing
This online article by Daniel Wildman appeared in Vol2 No3 of the ACM Interactions magazine. It examines the shortcoming of some types of formal usability testing and describes a test method that employs two users interacting with one workstation. (Jul-01-97)
The link address is: http://www.acm.org/interactions/vol2no3/columns/mandt/methtool.htm